• 한국식품과학회지
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• 제25권3호
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• pp.252-257
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• 1993

본 연구는 한우 9두를 E.S. 처리하여 비처리구와 물리화학적 차이를 비교함으로써 전기자극이 한우의 육질개선 효과에 미치는 영향을 살펴보기 위해 실시하였다. 일반적인 방법으로 도축을 실시한 후 45분 이내에 400V/60Herz로 1분간 전기자극 후 E.S. 처리구와 대조구에서 각 근육별로 시료를 취하여 $5^{\circ}C$와 $15^{\circ}C$로 구분하여 3일간 저장하며 실험한 결과는 다음과 같다. 도체에서의 lactate의 변화는 초기 E.S. 처리구가 대조구에 비해 2배 이상 증가하였다. 또한 E.S. 처리 직후부터 저장 4시간까지 E.S. 처리구가 대조구에 비해 근육내 lactate의 급속한 증가를 보이고 있으며(p<0.01), 직후 $6{\sim}8$시간까지 대조구에 비해 E.S. 처리구의 증가속도가 높았으나(p<0.05), 12시간 이후에는 완만하게 증가하여 24시간 이후에는 두 처리구 공히 거의 비슷한 경향을 보였고, 그에 따라 pH는 E.S. 처리구에서 고도의 유의성을 보이며 감소하였다. ATP는 E.S. 처리구가 급격한 감소를 보이면서, 저장 12시간까지 거의 분해되는 것으로 나타났으며, 저장 6시간에 $5^{\circ}C$에서 p<0.05의 유의차를 보인데 반하여 $15^{\circ}C$에서는 p<0.01로 고도의 유의차를 보이며 감소하였다. Shear force value는 전기자극 직후에 E.S. 처리구가 대체로 높았으나, 저장후 1일, 3일에는 E.S. 처리육이 연도가 개선되어(p<0.01) 전기자극에 의해 한 우육의 숙성이 효과적으로 촉진되었음을 확인하였다.

• 한국동물위생학회지
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• 제14권2호
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• pp.148-153
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• 1991

To investigate epidemological sitution of bovine viral diarrhea infection, serological survey in cattle being raised in Young Dong province were conducted. Bovine sera collected ramdomly from August 1990 to December 1990 were tested for bovine viral diarrhea virus serum neutralizing antibody titers. The results were as follows 1. BVDV SN antibody levels were considerably varies and positive rate was 58(108 heads out of 186) 2. BVDV SN antibodies to breeds of cattle was various and positive rates showed that diary cattle, beef, native cattle(Korean) were 67.52%, 59.38%, 27.00％ respectively followed in that order. 3. In the regional prevalence of BVD SN antibodies in cattle, Alpine(92％) was the highest, Young Dong south(59%) middle(44%), and North 30% followed in that order 4. In the age relatated prevalence of BVD SN antibodies, the younger than 6 month old group was the highest 65.7%, and older than 25 month old group was also at 62.2％. Then, 7 to 12 moth old group and 13 to 24 month old group showed to 58.5%, 52.1％ respectively. 5. The geometric mean titer (log2) of 108 cattle serum samples showing positive BVD SN antibodies was 4.3. 6. In the geometric mean titer(log2) according to age, younger than 6 month old group (5.2) was the highest, then 7 to 12 month old group 2.8(SD=1.94 standard deviation) was lowliest.

• Journal of Animal Science and Technology
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• 제53권6호
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• pp.541-548
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• 2011

This study was performed to determine the effects of dietary Kocetin$^{TM}$ on meat quality of Hanwoo (Korean native cattle) beef. Samples were divided into 3 groups; dietary supplementation of Kocetin$^{TM}$ (KC) at 21 and 42 ppm (n=4), and non-supplemented control (n=3) for 75 days. The KC composed of 10% of quercetin which was a bioactive compound. After slaughtering the Hanwoo, each loin from 10 Hanwoos were obtained and analyzed. Dietary supplementation of KC did not affect the final pH, water holding capacity, drip loss, cooking loss, surface color, total phenolics content, radical scavenging activity, and sensory scores. Dietary quercetin also showed no difference in both TBARS and VBN values. Textural profile analysis results also showed no difference, except for adhesiveness and springness. Springness was significantly higher in loin from Hanwoo treated by dietary KC at 42 ppm when compared to control. Results revealed that the loin from Hanwoo fed dietary KC up to 42 ppm (approximately 4.2 ppm of quercetin) was not sufficient to have clear positive effects on meat quality of loin.

• 한국축산식품학회지
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• 제28권5호
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• pp.604-609
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• 2008

한우도체의 육량등급요인인 도체중, 등지방두께 및 배장근단면적과 이들 요인으로 산정된 육량지수와 육량등급은 성 및 출하체중 별로 유의적인 차이가 있는 것으로 분석되었다. 본 연구에서 설정된 성별 도체의 소매 정육량 예측식은 적합도($R^2$)가 높아 유통현장에서 도체의 상품가치를 손상시키지 않고 신속하고 정확하며 저비용으로 소매 정육량을 예측하는데 유용하게 이용될 수 있으며 또한 국가에서는 소고기 수급계획 수립에 활용하고 브랜드한우단체 등에서는 직판장의 공급량 결정에 이용할 수 있겠다. 한우도체의 판매정육량을 좀더 정확하게 예측할 수 있는 추정식을 산출하기 위해서는 성별로 도체중, 등지방두께 및 배장근면적과 같은 측정요인이 출하체중 증가에 따라 균일하게 발현되도록 효과적인 개량과 사양관리가 선결되어야 하겠다.

• Asian-Australasian Journal of Animal Sciences
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• 제18권2호
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• pp.209-213
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• 2005

This study was conducted to determine the optimum substitution level of dried leftover food (DLF) in formula feed for Hanwoo (Korean Native Cattle) steers. A total of forty growing steers were assigned to 5 treatments based on substitution level of DLF (at 0, 25, 50, 75 and 100% level of formula feed). The experiment was carried out with growing steers from 6 months of age to 24 months of age. Average daily gain (ADG) was not affected by DLF substitution level up to 75% of formula feed. However ADG decreased at 100% substitution level. Daily feed intakes were similar among treatments but the amount of feed per 1 kg gain increased with increasing substitution level of DLF. Dressing percentage was around 62% in all treatments without any significant differences. Proportion of quality beef higher than grade 1 was the greatest from animals fed 25% substitution level of DLF. Economic efficiency for Hanwoo steer operator was the highest with 50% substitution level of DLF.

• Asian-Australasian Journal of Animal Sciences
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• 제18권6호
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• pp.898-907
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• 2005

Chromium has emerged as an essential trace mineral in nutrition. However, it readily causes toxicity because of slightly excessive dose and/or form of chromium supplement. Therefore, developing a noble form of chromium supplement which is capable of not only an increased availability but also a reduced toxicity has been a critical issue in chromium nutrition. Chromium-methionine chelate has been, so far, one of the latest developments in its kind. Although not much information is available for the chromium-methionine chelate, especially in view of animal performances upon dietary supplementation, several studies indicated chromium methionine chelate could be effective to improve meat quality by increasing muscle mass but decreasing body fat. Highly-graded beef was produced by dietary chromium methionine supplementation during fattening stage of Korean native steers. Body muscle was increased in replace of decreasing body fat in both pig and rat that were dietary supplemented with chromium methionine chelate. However, a pig farm study did not show any significant improvement of body gain upon supplementation of chromium methionine. Immune responses of pig and rat were not always dependent upon chromium form but were varied by species. These results suggest there could be a different mode of responses due to species as well as onset time of dietary supplementation of chromium methionine. It is still early to conclude the bio-efficacy of chromium methionine chelate presumably due to its recent appearance into the field. But the chelate is certainly worth more application to animal since it certainly reduced the application level of dietary chromium.

• Asian-Australasian Journal of Animal Sciences
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• 제15권3호
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• pp.390-395
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• 2002

Two experiments were conducted to study the performance and carcass characteristics of Hanwoo (Korean native beef cattle) steers (Experiment 1) and the nutrient digestibility of sheep (Experiment 2) when the animals fed diets containing four levels of dried wormwood (Artemisia sp.). For both experiments the animals were given a basal diet consisting of rice straw and concentrate mixed at 3:7 ratio (on DM basis). In Experiment 1, the treatments were designed as a completely randomized design with two feeding periods. Steers were allotted in one of four dietary treatments, which were designed to progressively substitute dried wormwood for 0, 3, 5 and 10% of the rice straw in the basal diet. Bodyweight gain and average daily gain (ADG) of Hanwoo steers fed diets containing the 5 and 10% wormwood inclusion were greater (p<0.05) than the 3% wormwood-feeding group. Total and daily intakes of roughage and concentrate were not altered by all levels of dried wormwood inclusion. However, the 10% dried wormwood inclusion led to increased total feed intake (p<0.05) compared with that of the 0 and 3% of dried wormwood inclusion. Carcass weight, carcass yield and backfat thickness were not altered by dried wormwood inclusion. The highest level of dried wormwood inclusion resulted in significantly increased (p<0.05) loin-eye area compared with the 0 and 5% levels of dried wormwood inclusion. Experiment 2 was designed by a $4{\times}4$ Latin square with four periods. Sheep were allocated in one of four dietary treatments as same as in Experiment 1. Digestibilities of DM and TDN were significantly increased (p<0.05) in sheep fed the diet containing all three levels of dried wormwood inclusion compared with the control treatment. Digestibilities of CP and crude fiber in the 5% dried wormwood inclusion highly increased (p<0.05) up to 8.2 and 5.5% respectively relative to the control treatment. The palatability was significantly improved (p<0.05) by the 5% dried wormwood inclusion compared with the control treatment. It is concluded that feeding diets containing dried wormwood substituted for equal weights of rice straw at 5 and 10% levels would be anticipated to provide better quality roughage for beef cattle production and higher income for beef cattle producers.

• Asian-Australasian Journal of Animal Sciences
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• 제15권4호
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• pp.549-554
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• 2002

An experiment was conducted to examine the performance and carcass characteristics of Hanwoo (Korean native beef cattle) heifers and the fatty acid composition of muscle tissues of the heifers when the animals fed diets containing four levels of dried wormwood (Artemisia sp.). For the experiment the animals were given a basal diet consisting of rice straw and concentrate mixed at 3:7 ratio (on DM basis). The treatments were designed as a completely randomized design with two feeding periods. Heifers were allotted in one of four dietary treatments, which were designed to progressively substitute dried wormwood for 0, 3, 5 and 10% of the rice straw in the basal diet. There was no difference in body weight gain throughout the entire period between the treatment groups. Feed conversion rate was improved (p<0.05) only by the 3% dried wormwood inclusion treatment compared with the basal treatment. Carcass weight, carcass yield and backfat thickness of all treatment groups were not altered by wormwood inclusion. The 5% dried wormwood inclusion significantly increased (p<0.05) the size of loin-eye area over the other treatments. The higher levels (5 and 10%) of dried wormwood inclusion resulted in the higher (p<0.05) water holding capacity (WHC) in loin than the lower levels (0 and 3%) of wormwood inclusion. The redness ($a^*$) and yellowness ($b^*$) values of meat color were significantly lower (p<0.05) in the top round muscle of heifers fed the diet containing 3% dried wormwood. There was a profound effect of the progressively increased intake of dried wormwood led to the linear increase of unsaturated fatty acid content and the linear decrease of saturated fatty acid content in the muscle tissues of Hanwoo heifers. It is concluded that the feeding diets containing dried wormwood substituted for equal weights of rice straw at 5% levels would be anticipated to provide better quality roughage for beef heifer production and economical benefits for beef cattle producers.

• Journal of Animal Science and Technology
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• 제57권3호
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• pp.14.1-14.7
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• 2015

A feeding trial was carried out to determine the effects of chromium methionine (Cr-Met) chelate and forage level over two years, $1^{st}$ fattening and $2^{nd}$ fattening period on growth parameters, carcass characteristics and blood metabolites of 46 Korean native (Hanwoo, Bos Taurus, $BW=183{\pm}44kg$) steers. Treatments were: 1) Steers in the low forage (LF) group were fed diets that consisted of 60% concentrate and 40% forage; 2) Steers in the high forage (HF) group were fed diets that consisted of 40% concentrate and 60% forage. Following the $1^{st}$ fattening period, steers ($BW=480{\pm}37.6kg$) were randomly assigned to four treatment groups: LF (40 F plus no Cr-Met supplementation in the $2^{nd}$ fattening period), LFCM (40LF plus added 400 ppb of Cr-Met during the $2^{nd}$ fattening period), HF (60 F plus no added Cr-Met during the $2^{nd}$ fattening period) and HFCM (60 F plus added 400 ppb of Cr-Met in the $2^{nd}$ fattening period). Dry matter intake of the treatment diets did not differ during the raising and $1^{th}$ fattening period (P > 0.05). The ADG in the raising period showed no difference between the 40 F and 60 F groups (P > 0.05). Carcass characteristics including rib-eye area and meat yield index were higher in HF than the other treatment groups (P < 0.05). The HF group tended to show a higher (P = 0.08) marbling score than the LF group whereas the HFCM group showed a higher marbling score than the LFCM group (P < 0.05). HDL was higher and LDL lower in groups fed with Cr-Met than in other groups whereas glucose showed the lowest value in HF group (P < 0.05). Triglyceride (TG), Cholesterol, PUN and total protein (TP) were the same among all treatment groups (P > 0.05). The Insulin concentration in the blood was significantly higher for the HFCM group than for the LF, LFCM and HF groups (P < 0.05). It is concluded that supplementation of chromium-methionine chelate could improve meat quality in beef steers.

• 한국식품위생안전성학회지
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• 제38권1호
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• pp.12-18
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• 2023

쇠고기 이력추적제는 소 개체마다 이력번호를 부여하여 수입쇠고기가 한우고기로 둔갑하는 사례를 막고, 소비자에게 구입한 한우고기의 세부 이력 정보들을 제공하는 데 도움을 준다. 이번 연구는 2021년-2022년 서울지역 대형 축산물판매업소에서 유통되는 한우고기 344건에서 DNA 동일성 검사를 실시하여 이력번호 등 주요 표시정보들의 진위를 판별하였다. 그 결과 45건(13.1%)에서 이력번호가 불일치한 것으로 확인되었다. 불일치율은 2021년(14.7%)에 비해 2022년(11.3%) 감소하였고, 도심서북권 20.7%, 동북권 14.4%, 서남권 및 동남권 10.2% 순으로, 북부권(16.9%)이 남부권(10.2%)에 비해 높게 나타났다. 또한 6개 브랜드 중 B사 및 D사는 이력관리가 양호한 반면, E사 및 A사는 이력관리가 취약한 것으로 확인되었고, 통계적으로 유의한 결과 차이를 보였다(P<0.001). 이력번호 불일치 시료의 실제 이력번호는 업소 내 입(출)고 거래내역 자료를 근거로 조사하였고, 그 결과 실제 이력번호 확인율은 53.9%에 불과하였으나, 확인된 범위 내에서 시료의 표시정보 진위 판별 결과, 거짓 표시는 이력번호 13.1%, 성별 2.9%, 도축장명 2.2%, 등급 1.6% 순으로 나타났고, 품종(한우) 거짓 표시는 없었다. 거짓 표시 축산물의 유통 차단을 위해 표시정보의 신속한 진위 판별이 중요하므로 업소 내 이력번호가 기재된 날짜별 부분육 소분할 작업내역 작성을 의무화하는 법적 근거 마련이 필요하다. 본 연구 결과는 투명한 축산물 유통 거래 질서 정착을 위한 이력관리 방향 설정에 참고자료로 활용하고자 한다.